TireSizesFinder

145/80R13 vs 175/55R15

175/55R15 is 0.44 in (11.3 mm) taller than 145/80R13, a +2.01% diameter difference. With the speedometer set for 145/80R13, an indicated 60 mph is 61.2 mph on 175/55R15.

Is this a safe swap?

Diameter difference +2.01%: within the ±3% guideline

By overall diameter alone, 175/55R15 falls inside the ±3% range commonly used as a guideline when replacing 145/80R13. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 145/80R13 (22.13 in) vs 175/55R15 (22.58 in)145/80R1322.13 in × 5.71 in175/55R1522.58 in × 6.89 in
Side profile and tread width, drawn to the same scale.
145/80R13 vs 175/55R15 differences
Measurement145/80R13175/55R15Difference% diff
Overall diameter22.13 in (562.2 mm)22.58 in (573.5 mm)+0.44 in (+11.3 mm)+2.01%
Sidewall height4.57 in (116.0 mm)3.79 in (96.3 mm)−0.78 in (−19.7 mm)−17.03%
Section width5.71 in (145.0 mm)6.89 in (175.0 mm)+1.18 in (+30.0 mm)+20.69%
Circumference69.54 in (1,766.2 mm)70.93 in (1,801.7 mm)+1.40 in (+35.5 mm)+2.01%
Revolutions per mile911893−18−1.97%
True speed with the speedometer calibrated for 145/80R13
IndicatedActual on 145/80R13Actual on 175/55R15Difference
30 mph30.0 mph30.6 mph+0.6 mph
60 mph60.0 mph61.2 mph+1.2 mph
75 mph75.0 mph76.5 mph+1.5 mph

Ride-height change: 175/55R15 raises the vehicle by 0.22 in (5.6 mm) at the axle (half the +11.3 mm diameter difference).

175/55R15 is 0.44 in taller than 145/80R13 and 30 mm wider, a 2.01% difference in overall diameter.

With the speedometer calibrated for 145/80R13, an indicated 60 mph is actually 61.2 mph on 175/55R15, and revolutions per mile change from 911 to 893.

175/55R15 mounts on a 15-inch wheel, a plus-2 fitment from the 13-inch wheel of 145/80R13.

Size pages

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.